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<h1>X</h1>

<dl>

<dt><a name="xchg"><code>(xchg 'var 'var ..) -> any</code></a>
<dd>Exchange the values of successive <code>var</code> argument pairs. See also
<code><a href="refS.html#swap">swap</a></code> and <code><a
href="refS.html#set">set</a></code>.

<pre><code>
: (setq  A 1  B 2  C '(a b c))
-> (a b c)
: (xchg  'A C  'B (cdr C))
-> 2
: A
-> a
: B
-> b
: C
-> (1 2 c)
</code></pre>

<dt><a name="xor"><code>(xor 'any 'any) -> flg</code></a>
<dd>Returns T if exactly one of the arguments evaluates to non-<code>NIL</code>.

<pre><code>
: (xor T NIL)
-> T
: (xor T T)
-> NIL
</code></pre>

<dt><a name="x|"><code>(x| 'num ..) -> num</code></a>
<dd>Returns the bitwise <code>XOR</code> of all <code>num</code> arguments. When
one of the arguments evaluates to <code>NIL</code>, it is returned immediately.
See also <code><a href="ref_.html#&">&</a></code>, <code><a
href="ref_.html#|">|</a></code> and <code><a
href="refB.html#bit?">bit?</a></code>.

<pre><code>
: (x| 2 7)
-> 5
: (x| 2 7 1)
-> 4
</code></pre>

</dl>

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